Peel shrimp, devein and remove tails. You can leave the tails on, but my family likes them removed.

In a large bowl, whisk together flour, cornstarch, baking soda, egg, paprika, seasoning salt, cayenne pepper, parsley and 1/2 cup ice water. Whisk in remaining water, 1/4 cup at a time, to thin batter. Place bowl in second bowl filled with ice water.